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Overview of the Current Week
2025/04/17 - 2025/04/25
Nine red tides were sighted during the past week, the Inter-departmental Red Tide Working Group reported today (April 25).
On April 18, mariculturist spotted the first red tide at Sham Wan fish culture zone. On April 22, staff of the Agriculture, Fisheries and Conservation Department (AFCD) spotted the second red tide at Tap Mun fish culture zone. On April 22, staff of the Leisure and Cultural Services Department (LCSD) spotted two red tides in Golden Beach and Kadoorie Beach, Tuen Mun respectively. On April 23, LCSD staff spotted three red tides at Ma Wan Tung Wan Beach, Ting Kau Beach, Lido Beach and Casam Beach, Tsuen Wan respectively. At the same day, AFCD staff spotted a red tide in Western waters of Hong Kong. On April 24, members of the public spotted a red tide in Victoria Harbour.
The red tides at Sham Wan fish culture zone, Tap Mun fish culture zone, Western waters of Hong Kong and Victoria Harbour still persist, while the other five red tides have dissipated. No associated fish deaths have been reported as of today.
A spokesman for the working group said, "The red tides at Sham Wan fish culture zone and Tap Mun fish culture zone were formed by Gonyaulax polygramma, which is commonly found in Hong Kong waters and is non-toxic. The other seven red tides were formed by Mesodinium rubrum, which is commonly found in Hong Kong waters and is non-toxic. "
The AFCD urged mariculturists at the fish culture zones of Yim Tin Tsai, Yim Tin Tsai East, Yung Shue Au, Lo Fu Wat, Tap Mun, Kau Lau Wan, Sham Wan, Ma Wan, Lo Tik Wan, Sok Kwu Wan and Cheung Sha Wan to monitor the situation closely and increase aeration where necessary.
Red tide is a natural phenomenon. The AFCD's proactive phytoplankton monitoring programme will continue to monitor red tide occurrences to minimise the impact on the mariculture industry and the public.
Please click here to view the location of red tide sighted in Hong Kong waters.
You can visit the Hong Kong Red Tide Information Network for information about red tide or press here to view real-time water quality in fish culture zones.
Last update: 2025/04/25 noon
Red Tide Reporting Network
We welcome your assistance in reporting red tide to us. Please record the following information:
(1) location of red tide
(2) colour of the seawater
(3) extent of the red tide
(4) occurrence of dead fish and any other abnormal features observed around the red tide.
Please report to:
3468 3714 (office hours) OR 1823 (outside office hours)
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